Does anyone have experience with the Parasol Ferris Wheel feeder for hummingbirds? It doesn't seem like the hummers like using it. Anyone have any ideas why?

I have seen hummers use it though, but ever since used it to replace a hummzinger, I haven't seen any hummers drinking from it. It seems like the hummzinger is what brought them in. I also noticed that if placed side by side they prefer the hummzinger.

I have Ferris Wheel feeder filled about an inch with nectar in each of its bottles, I don't know if this makes a difference. I'm not sure if they can reach the nectar to the bottom of the glass or not.